'f(f(O))>f(O)': Iran's 'Mathematical' Warning To US After Hormuz Blockade

'f(f(O))>f(O)': Iran's 'Mathematical' Warning To US After Hormuz Blockade
US President Donald Trump has said the American Navy would swiftly begin a blockade of ships entering or leaving the Strait of Hormuz after US-Iran ceasefire talks in Pakistan ended without an agreement.